Forming roll



Dec. l5, 1953 L. G. zEsBAUGH 2,662,451

FORMING ROLL Filed July 2l, 1950 2 Sh'eetp-Sheet 2 FIG. .2

FIG. 6

/NvE/vron. LAWRENCE G. zEseAuGH Patented Dec. 1.5, n1953 UNITED STATES PATENT OFFICE F ORMIN G- ROLL pany, Minneapolis, Minn. AnplicationJuly ,21, 1950, Serial No. ,175,059

2 Claims.

This invention relates -to a new and useful improvement in apparatus for making composition board, commonly known as Insulite board, adapted for use in construction for buildings and various other purposes.

In the manufacture of fiber composition board, the pulp slurry is supplied to the forming apparatus, with a low concentration of pulp; in other Words, there is substantially more than 98% of the slurry water. This water has to be removed in the forming of the board and drying after formation. The ber composition board is usually made in a, S and 12 widths; more commonly in 12 widths and ,after drying divided into suitable or desired widths. To support a surface of a forming roll about Y12 in width requires a number of supporting members for the perforated surface. Heretofore there have been attempts to use various types of forming cylinders but generally in the space over the supporting spiders the water is not uniformly removed compared to the spaces between the spiders, The water forced from the sheet over the spider areas is often taken up by the `board again as soon as the pressure is removed.

One of the principal objects of the invention is to form a roll for making composition board which will readily remove water from the -forming or formed web, which is simple in design, sturdy and effective in operation, and adapted to be operated and maintained with a minimum effort and expense.

Other and further objects of the invention and the advantages of the same will be pointed out hereinafter and specifically indicated in the appended claims or will be obvious to one skilled in the art upon understanding of the present disclosure.

For the purpose of this application, there has been elected to set forth one particular structure and particular method of producing the same, but it is to be understood that they are here presented for illustrative purposes only and are not to be accorded any interpretation such as might have the effects of limiting what is claimed short of its true and comprehensive scope in the art.

Referring to the drawings:

Figure l is a vertical sectional View of an irnproved apparatus showing one form of apparatus in which the rotatable perforated cylinders may be used;

Figure 2 is a sectional view with parts broken away of the improved forming cylinder;

Figure 3 is a view of the upper end of one of 55 the supporting fibers used in the improved forming cylinder;

Figure 4 is a tcp plan View of a part of a spider shown in Figure 3;

Figure 5 is an enlarged sectional view with parts broken away of the outer surface of the spider before the screen or foraminous material has been applied; and

Figure 6 is a sectional View of a portion of the shell of the forming cylinder showing the forainnous or screen mem-ber and the method of attaching the same.

Referring to the drawings in detail, there is shown in Figure l for the purpose of disclosure, a machine or apparatus for making composition board or sheets. This apparatus comprising a pair of rotatable screen covered cylinders iii and l2. It is preferred that these cylinders be geared together for simultaneous rotation 'by a. suitable gear (not shown). These cylinders lo and i2 are mounted respectively over vats ifi and l@ to and it and is picked up by the surface of the cylinders It and le and brought together and, during the bringing together of the pulp is picked up by the surface of the cylinder, a large quantity of the water is removed by the pressure between two cylinders. The board so formed is then suitably dried, for example, in a steam drying kiln.

Each cylinder consists of a shaft 32 on which are mounted in spaced-apart relation spiders 2e. The upper end of each spider 2e has a rim portion 22, and on the outer surface of this portion is 'the cylinder contacting portion 2d. The rim of the spider is of less width than the spider and the cylinder contacted part 2d of the rim is the narrow part of the rim (see Figure 2). inder contacting portion 2d is notched as at 2d on both sides of the upper surface so as to provide a water drainage passage which is in register with water drainage passage 3d in the cylinder surface material. After the surface of the cyln inder has been applied, there is uniformly provided water drainage passages ed. Each drainage passage over the spider egisters with a notch 2li. This is clearly shown in Figure 5 where the drainage passage 3d registers with the notch 26. After the cylinder surface material has been perforated to form a foraminous covering, a screenlike material is secured over the surface of the cylinder. This is accomplished by providing a small opening 34 adjacent each of the water drainage passages 39 and a suitable fastening member such as a wire 39 is inserted through the water drainage passage and the other leg through a small opening 3d adjacent thereto and the free ends secured inside the cylinder (see Figure 6).

In the manufacture of a cylinder l2, a shaft 32 has spaced-apart spiders 20. The spiders peripheries are uniformly side notched to provide the water drainage passages 25. The notches on the side of the rim of the spider on oneside of the spider are offset wih respect to the notches on the other side. The width of the notch at the top is approximately one-half the thickness of the rim width. The metal covering 223 is then secured over the spiders. Thereafter the metal covering 28 is drilled to provide water drainage passage 39 and the associated opening 34. The screen 36 is then positioned on the metal surface and is secured in place by suitable fastening means 38.

ln operation, the quantity of stock and water delivered to the head box l1 is preferably such as to cause a portion of the stock to be returned through an overflow (not shown) to the source of supply, thus retaining a constant head in the box il which tends to maintain a constant static pressure against the perforated peripheries of the cylinders I and l2 in the vats I4 and i6. The two vats communicate with each other as well as with the head box il. The stock is deposited upon the rotating surfaces of the cylinders I9 and l2. The water passes through the foraminous cylinder surfaces; thus the stoel; is built up to the desired thickness on the cylinder surfaces. A considerable pressure is applied to the pulp on the cylinder surfaces as ythe sheet is formed and much of the water is eliminated. By the arrangement shown the ivater forced from the sheet in formation is drained away through water passages 39.

1t is to be understood that the apparatus is designed and arranged in such a manner that the sheets may be made of any desired thickness.

What is claimed:

1. A forming roll of the character described used in an apparatus for ma ing fiber composition board from a fiber slurry, comprising a substantially, horizontally extended shaft, a plurality of spaced apart spiders secured upon the shaft, a rim on the outer side of each spider` of narrower width than the spider and having a cylinder contacting portion narrower than the rest of the rim with the surface contacting portion of the rim having sloped notches therein on opposed sides, said notches extending through the side faces of the rim the notches on one side of the rim offset from the notches on the other side a metal covering secured on the spider rims and in contact with the cylinder contacting portions, the metal covering provided with uniformly spaced water drainage passages, and a foraminous member secured over the metal covering, the water drainage passages in the metal covering occuring over the spider rim contacting portions registering with the sloped notches in the spider rim contacting portion.

2. The apparatus of claim 1 wherein the foraminous member is secured in place by wire means extending through a water drainage passage and an adjacent small opening in the metal covering.

LAWRENCE G. ZESBAUGH.

References Cited in the ille of this patent UNITED STATES PATENTS Number Name Date 327,061 Bills Sept. 29, 1885 447,559 Crawford Mar. 3, 1891 1,131,066 Kurtz-Hahnle Mar. 9, 1915 1,196,389 Olsen Aug. 29, '1916 1,493,537 Hawg May 13, 1924 2,183,484 Peterson Jan. 30, 1940 2,255,939 Overstrom et al. Sept. 16, 1941 2,352,340 Oswald June 27, 1944 FOREIGN PATENTS Number Country Date 104,897 Germany Jan. 1, '1899 404,123 Great Britain Jan. 11, 1934 

